[TOC] ## rpcx 調用[通過傳遞 string(tranid,spanid,parentSpanId)] [rpcx_jaeger [tracing_string] ](https://github.com/idcpj/rpcx_jaeger/tree/tracing_string) 核心代碼 ``` /** 改函數只適用于 jaeger 通過傳遞 tracekey string 來追蹤 @tracekey 格式 : 6f8b8a1101b0124f:6f8b8a1101b0124f:0000000000000000:1 首個 span span, carrier, _ := lib.GenerateSpanWithContext( "first2","") defer span.Finish() 之后 通過傳遞 carrier 來實現追蹤 span, _, _ := lib.GenerateSpanWithContext( "first2",carrier) defer span.Finish() */ func GenerateSpanWithContext(operationName string, traceKey string) (opentracing.Span, string, error) { var span opentracing.Span tracer := opentracing.GlobalTracer() if traceKey != "" { spanContext, err := jaeger.ContextFromString(traceKey) //通過 traceKey 獲取 spanContext if err != nil { log.Printf("metadata error %s\n", err) return nil, "", err } span = tracer.StartSpan(operationName, ext.RPCServerOption(spanContext)) } else { span = opentracing.StartSpan(operationName) } metadata := opentracing.TextMapCarrier(make(map[string]string)) err := tracer.Inject(span.Context(), opentracing.TextMap, metadata) if err != nil { return nil, "", err } return span, metadata[jaeger.TraceContextHeaderName], nil } ```